Connection sleeve for a suction tube furnished with a wire protecting sheathing for strain relieved electrical conductors

ABSTRACT

A connection sleeve for a suction tube furnished with a wire protecting sheathing for strain relieve electrical conductors is disclosed. The wire protective sheathing is attached at the inner jacket face of the suction tube, wherein a sleeve body is partially plugged into the suction tube. An axial slot begins at the plug in end of the sleeve body, wherein the flanks of the axial slot transition into a pipe like shape formed for the receiving of the coordinated end of the wire protecting sheathing. The electrical conductors are led out of the sleeve body in the region of a section of the axial slot not covered by the suction tube, while an end of the strain relieve element protruding together with the electrical conductors out of the wire protecting sheathing is pull safe united with the sleeve body. The strain relieve element grips through a cross wall aligned perpendicular to the axis of the sleeve body and furnished in the pipe like body and the strain relieve element is secured against pulling back with a thickening on the side of the cross wall directed toward the front end of the sleeve body.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a connection sleeve for a suction tubefurnished with a wire protecting sheathing for strain relievedelectrical conductors.

2. Brief Description of the Background of the Invention Including PriorArt

A female disconnect for suction tube furnished with a protectivecovering for strain relieved electrical conductors is already known. Aring groove is furnished in the jacket of a coupling sleeve bodypartially inserted into the tube, wherein two strings of a strainrelieved element led out of the protective covering are joined at acommon location. The threads grip around the floor of the ring groove inopposite direction and are tied together with a knot at the positionwhere they meet again and are thereby in a position jointly receive andaccept the operating pull forces acting on them.

In addition an outer sleeve is furnished in connection with the knownfemale disconnect, wherein the outer sleeve covers the ring groove andexhibits at its internal jacket face at least one raised and projectedthread turn, wherein the thread turn engages into a wave valley of thesuction tube exhibiting on the outside screw like shaped running wavemountains and wave valleys. The conventional construction has alreadyproven itself, however the conventional construction causes a relativelylarge outer diameter of the sleeve body based on the ring groove becauseof the presence of the ring groove (German petit patent DE-Gbm 29,708,274.4).

Furthermore already a female disconnect has been proposed, wherein alsoa protective covering for electrical conductors and a strain reliefelement is furnished at the inner wall of a suction tube. One end of thestrain relieved element is led out of the protective covering into agroove like recess of the first sleeve part and is fixed here inposition by injection molded material. Furthermore a second sleeve partis furnished wherein the second sleeve part is connected to the firstpart by way of material injected into the groove like recess. Theinjection molding of the material fixing the end of the strain relievedelement and connecting the two sleeve parts together is an expensive andequipment requiring production process.

There is also known a vacuum cleaner tube with electrical conductorsexhibiting on the outside helically running wave valleys and wavemountains from German petit patent DE-Gbm 29,912,640.4, wherein theelectrical conductors are disposed in a protective sheathing attached tothe inner wall of the tube. An end bush is plugged into the end of thetube, wherein the end bush exhibits an axial slot open at its rear end,wherein the flanks of the axial slot transition into a projecting formfor receiving the wire protecting sleeve. The ends of the electricalconductors are in each case led through the axial slot and arethereafter connected with a slip ring of a slip ring carrier, whereinthe slip ring carrier surrounds the tube and the end bush. The carrierof the slip ring or collector ring grips into a wave valley of the tubewith a projecting winding thread formed at the inner surface of the slipring carrier and the slip ring carrier is connected shape matching tothe end bush.

SUMMARY OF THE INVENTION

1. Purposes of the Invention

It is an object of the present invention to provide a strain relievedelement at a connection sleeve for an electrical conductor suction suchthat a ring groove can be dispensed with and thereby an enlargement ofthe outer diameter of the sleeve is avoided.

These and other objects and advantages of the present invention willbecome evident from the description which follows.

2. Brief Description of the Invention

The present invention provides a connection sleeve for a suction tubefurnished with a wire protecting sheathing for strain relievedelectrical conductors. A suction tube shows an inner jacket face. A wireprotecting sheathing is attached at the inner jacket face of the suctiontube. A sleeve shaped sleeve body includes a plug in end and a frontend, wherein an axial slot having flanks begins at the plug in end ofthe sleeve body, and wherein the sleeve body is partially inserted andplugged into the suction tube. A pipe like body is attached to thesleeve body and has a front end, wherein the flanks of the axial slottransition into the pipe like body, and wherein the pipe like body isformed for receiving of a coordinated end of a wire protectingsheathing. The pipe like body is open at the plug in end side of thesleeve body and the pipe like body is closed at the front end of thesleeve body. The pipe like body is formed for receiving of a coordinatedend of a wire protecting sheathing.

An electrical conductor is led out of the sleeve body in the region of asection of the axial slot not covered by the suction tube. A strainrelieve element is disposed in the pipe like body. An end of the strainrelieve element protrudes together with the electrical conductor out ofthe wire protective sheathing and is united pull safe with the sleevebody. A strain relieve element is disposed in the wire protectingsheathing. A cross wall is disposed at the front end of the pipe likebody. The strain relieve element grips through the cross wall disposedin the pipe like body and is aligned perpendicular to the axis of thesleeve body. The strain relieve element is secured in its positionagainst pulling out with a thickening disposed on the side of the crosswall directed toward the front end of the sleeve body.

The novel features which are considered as characteristic for theinvention are set forth in the appended claims. The invention itself,however, both as to its construction and its method of operation,together with additional objects and advantages thereof, will be bestunderstood from the following description of specific embodiments whenread in connection with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING

In the accompanying drawing, in which are shown several of the variouspossible embodiments of the present invention:

FIG. 1 is a longitudinal sectional view through a connection sleeve,

FIG. 2 is a perspective view of the body of the sleeve.

DESCRIPTION OF INVENTION AND PREFERRED EMBODIMENT

A tube exhibiting wave mountains and wave valleys running smoothly onthe inside and helical shaped on the outside is designated with thereference numeral 1 in FIG. 1. The reference numeral 2 designates a wireprotecting sheathing for electrical conductors 3 and for a strainrelieve element 4 for the electrical conductors 3, wherein the wireprotecting sheathing is attached at the inner wall of the tube 1.

A bush shaped sleeve body 5 is partially inserted and plugged into thetube 1. The tube 1 is formed like helical bellows on its outside forallowing to be engaged and fixed in relative position by a projectingwinding thread 6 c. The inside surface of the tube 1 is substantiallycylindrical and constructed to fit over the outer surface of the sleevebody 5. The suction tube 1 is positioned to cover a length of from about0.5 to 0.9 times the length of a plug in end of the sleeve body 5.

An axial slot 5 a (FIG. 2) begins at the plug in end of the sleeve body5, wherein the flanks of the axial slot 5 a transition into a pipe likeshape 5 b (FIG. 2) formed for the receiving of the coordinated end ofthe wire protecting sheathing 2. The wire protecting sheathing 2 can beformed as a tube as shown in FIG. 1 or altentatively as a tube having aslot disposed in parallel to the axis of the wire protecting sheathing2. The sleeve body 5 is furnishes with a plug in end where theelectrical wire comes out of the sleeve body 5 and with a front end. Thepipe like shape or body 5 b is open at the plug in end of the sleevebody 5 and is closed at the opposite end of the sleeve body 5 designatedas front end.

The pipe like shape or body 5 b is further open in an area where thepipe like shape 5 b overlaps with the sleeve body 5 by forming theaxially directed slot 5 a. The slot 5 a can have a width of from about0.5 to 1.5 times the inner diameter of the pipe like shape 5 b. The slot5 a can extend from the plug in end fo the sleeve body 5 to the positionof a cross wall 5 d in a direction parallel to the axis of the sleevebody 5.

The sleeve body 5 preferably has a front end with an outer diameterabout 1.1 to 1.2 times the outer diameter of the plug in end section ofthe sleeve body 5.

The sleeve body 5 preferably has a front end with an inner diameterabout 1.05 to 1.2 times the inner diameter of the plug in end section ofthe sleeve body 5.

The length of the plug in end section of the sleeve body 5 can be fromabout 3 to 10 times the length of the front end of the sleeve body 5 andis preferably from about 4 to 7 times the length of the front end of thesleeve body 5.

The thickness of the plug in end section of the sleeve body 5 can befrom about 0.3 to 1.0 times the thickness of the front end of the sleevebody 5 and is preferably from about 0.4 to 0.7 times the thickness ofthe front end of the sleeve body 5.

The distance of the pipe like shape or body 5 b from an axis of thesleeve body can be from about 0.3 to 0.7 times the inner radius of thesleeve body 5 at the plug in section and is preferably from about 0.4 to0.6 times the inner radius of the sleeve body 5 at the plug in section.

The electrical conductors 3 are led out of the sleeve body 5 in theregion of a section of the slot 5 a not covered by the tube 1 and theelectrical conductors 3 are connected there in each case to a slip ring6 a of a slip ring carrier 6. The slip ring carrier 6 in part rests onthe outer jacket face of the tube 1 and engages with a projectingwinding thread 6 c disposed on the inside of the slip ring carrier 6into a wave valley of the tube 1. Recesses of the slip ring carrier 6disposed at the front end of the slip ring carrier 6 are in each casepenetrated and gripped through by a cam 5 c of the sleeve body 5 at thefront end of the slip ring carrier 6. The slip ring carrier 6 is therebyfixed radially and axially.

The slip ring carrier 6 is preferably made of an inner tube body havingthe recesses engaging the sleeve body 5 and having the cam 6 c and anouter tube body supporting the slip rings 6 a. The outer tube body canhave stepped recesses for the slip rings 6 a, wherein a first stepcorresponds to an outer surface of the slip ring and wherein the secondstep corresponds to a seat for the slip ring 6 a and located within thefirst step. The length of the slip ring carrier 6 can be from about 0.8to 1.5 times the length of the plug in section of other sleeve body andis preferably from about 1.0 to 1.2 times the length of the plug insection of other sleeve body.

A cross wall 5 d is formed in the tubular like shape 5 b, wherein thecross wall 5 d a recess 5 e (FIG. 2) serving for the gripping through ofthe strain relieve element 4. The size of the crosswall 5 d correspondsgenerally to the inner cross-section of the pipe like shape 5 b.Preferably, the cross wall 5 d is furnished with a hole opening disposedabout a middle of the cross wall 5 d.

As can be recognized from FIG. 1, the strain relieve element 4 issecured in its position with a thickening 4 a on the side of the crosswall 5 d directed toward the front end of the sleeve body 5 againstpulling out of its position.

Advantageously the thickening 4 a can be formed by a knot made out ofthe strain relieve element 4 as illustrated in FIG. 1. In order toincrease and strengthen the resistance against pulling out of the crosswall 5 d, the knot can be soaked with self-hardening material, forexample a second adhesive, crazy glue, or another suitable adhesive.

The thickening 4 a however can also be formed by a cramp attached at thestrain relieve element 4.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofcable system configurations and strain relief procedures differing fromthe types described above.

While the invention has been illustrated and described as embodied inthe context of a connection sleeve for a suction tube furnished with awire protecting sheathing for strain relieved electrical conductors, itis not intended to be limited to the details shown, since variousmodifications and structural changes may be made without departing inany way from the spirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can, by applying current knowledge,readily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this invention.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims:
 1. A connection sleeve for a suctiontube furnished with a wire protecting sheathing for strain relievedelectrical conductors comprising: a suction tube having an inner jacketface; a wire protecting sheathing attached at the inner jacket face ofthe suction tube; a sleeve shaped sleeve body having a plug in end andhaving a front end, wherein an axial slot having flanks begins at theplug in end of the sleeve body, wherein the sleeve body is partiallyinserted and plugged into the suction tube; a pipe like body attached tothe sleeve body and having a front end, wherein the flanks of the axialslot transition into the pipe like body, wherein the pipe like body isformed for receiving of a coordinated end of the wire protectingsheathing, wherein the pipe like body is open at the plug in end of thesleeve body and wherein the pipe like body is closed at the front end ofthe sleeve body, and an electrical conductor led out of the sleeve bodyin the region of a section of the axial slot not covered by the suctiontube; the strain relieve element disposed in the pipe like body, whereinan end of the strain relieve element, protruding together with theelectrical conductor out of the wire protective sheathing, is unitedpull safe with the sleeve body; the strain relieve element disposed inthe wire protecting sheathing; a cross wall disposed at the front end ofthe pipe like body, wherein the strain relieve element grips through thecross wall disposed in the pipe like body and is aligned perpendicularto the axis of the sleeve body, and wherein the strain relieve elementis secured in its position against pulling out with a thickeningdisposed on the side of the cross wall directed toward the front end ofthe sleeve body.
 2. The connection sleeve according to claim 1, whereinthe thickening comprises a knot formed out of the strain relieveelement.
 3. The connection sleeve according to claim 2, wherein the knotis soaked with a self hardening material.
 4. The connection sleeveaccording to claim 1, wherein the thickening comprises a cramp attachedat the strain relieve element.
 5. A connection sleeve for a suction tubefurnished with a wire protecting sheathing for strain relievedelectrical conductors wherein: a) a wire protecting sheathing (2) isattached at an inner jacket face of a suction tube (1), wherein a sleeveshaped sleeve body (5) is partially inserted and plugged into thesuction tube (1); b) an axial slot (5 a) begins at a plug in end of thesleeve body (5), wherein the flanks of the axial slot (5 a) transitioninto a pipe like shape (5 b) formed for receiving of a coordinated endof the wire protecting sheathing (2), wherein the pipe like shape (5 b)is open at the plug in end of the sleeve body (5) and is closed at theopposite end; c) the electrical conductors (3) are led out of the sleevebody (5) in the region of a section of the axial slot (5 a) not coveredby the suction tube (1), while an end of a strain relieve element (4),protruding together with electrical conductors (3) out of the wireprotective sheathing (2), is united pull safe with the sleeve body (5);d) the strain relieve element (4) grips through a cross wall (5 d)disposed in the pipe like shape (5 b) and aligned perpendicular to theaxis of the sleeve body (5) and wherein the strain relieve element (4)is secured in its position against pulling out with a thickening (4 a)disposed on the side of the cross wall (5 d) directed toward the frontend of the sleeve body (5).
 6. The connection sleeve according to claim5, wherein the thickening (4 a) comprises a knot formed out of thestrain relieve element (4).
 7. The connection sleeve according to claim6, wherein the knot is soaked with a self hardening material.
 8. Theconnection sleeve according to claim 5, wherein the thickening (4 a)comprises a cramp attached at the strain relieve element (4).